G guncrank New member Dec 9, 2010 #21 To measure the distances down inside the receiver, I use a depth micrometer, not the tail end of a dial caliper. And the rest of what Clark said. Books are good too. And I have got some good things out of them.
To measure the distances down inside the receiver, I use a depth micrometer, not the tail end of a dial caliper. And the rest of what Clark said. Books are good too. And I have got some good things out of them.
